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<li class="navelem"><a class="el" href="dir_d44c64559bbebec7f509842c48db8b23.html">include</a></li><li class="navelem"><a class="el" href="dir_b519bdaee6a7f8dbbe55c1237cf8f544.html">native</a></li>  </ul>
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<a href="native_2farm_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;</div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="preprocessor">#ifndef GRPPI_NATIVE_FARM_H</span></div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor">#define GRPPI_NATIVE_FARM_H</span></div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;</div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="parallel__execution__native_8h.html">parallel_execution_native.h</a>&quot;</span></div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;</div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="preprocessor">#include &lt;thread&gt;</span></div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="preprocessor">#include &lt;utility&gt;</span></div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="preprocessor">#include &lt;memory&gt;</span></div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="preprocessor">#include &lt;experimental/optional&gt;</span></div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;</div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacegrppi.html">grppi</a> {</div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Generator, <span class="keyword">typename</span> Consumer&gt;</div><div class="line"><a name="l00051"></a><span class="lineno"><a class="line" href="group__farm__pattern__native.html#ga0b65fab8b478d7403f32be8a6d2e17ba">   51</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="group__farm__pattern.html#ga26bdb7c1b6c3d4bedbcfc1774d00833c">farm</a>(<a class="code" href="classgrppi_1_1parallel__execution__native.html">parallel_execution_native</a> &amp; ex, Generator generate_op, </div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;          Consumer consume_op) </div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;{</div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;  <span class="keyword">using namespace </span><a class="code" href="namespacestd.html">std</a>;</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;  <span class="keyword">using</span> result_type = <span class="keyword">typename</span> result_of&lt;Generator()&gt;::type;</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;  <span class="keyword">auto</span> queue = ex.<a class="code" href="classgrppi_1_1parallel__execution__native.html#a5c310952de159f2b4d62bdae4b360d8f">make_queue</a>&lt;result_type&gt;();</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;  vector&lt;thread&gt; tasks;</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=0; i&lt;ex.<a class="code" href="classgrppi_1_1parallel__execution__native.html#aae3c5760c422c19a391ce1ddaa5e9f0b">concurrency_degree</a>(); ++i) {</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;    tasks.emplace_back([&amp;](){</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;      <span class="keyword">auto</span> manager = ex.<a class="code" href="classgrppi_1_1parallel__execution__native.html#aa3fb66a10cab14001a371be7b351c745">thread_manager</a>();</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;      <span class="keyword">auto</span> item{queue.pop()};</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;      <span class="keywordflow">while</span>(item) {</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;        consume_op(*item);</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;        item = queue.pop();</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;      }</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;      queue.push(item);</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;    });</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;  }</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;  <span class="keywordflow">for</span> (;;) {</div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    <span class="keyword">auto</span> item{generate_op()};</div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    queue.push(item);</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;    <span class="keywordflow">if</span> (!item) <span class="keywordflow">break</span>;</div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;  }</div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;</div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;  <span class="keywordflow">for</span> (<span class="keyword">auto</span> &amp;&amp; t : tasks) { t.join(); }</div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;}</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Generator, <span class="keyword">typename</span> Transformer, <span class="keyword">typename</span> Consumer&gt;</div><div class="line"><a name="l00093"></a><span class="lineno"><a class="line" href="group__farm__pattern__native.html#ga6924f3908c815671b9a237132ea656df">   93</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="group__farm__pattern.html#ga26bdb7c1b6c3d4bedbcfc1774d00833c">farm</a>(<a class="code" href="classgrppi_1_1parallel__execution__native.html">parallel_execution_native</a> &amp; ex, Generator generate_op, </div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;          Transformer transform_op , Consumer consume_op) </div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;{</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;  <span class="keyword">using namespace </span><a class="code" href="namespacestd.html">std</a>;</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;  <span class="keyword">using namespace </span>experimental;</div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;  <span class="keyword">using</span> generated_type = <span class="keyword">typename</span> result_of&lt;Generator()&gt;::type;</div><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;  <span class="keyword">using</span> generated_value_type = <span class="keyword">typename</span> generated_type::value_type;</div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;  <span class="keyword">using</span> transformed_value_type = </div><div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;      <span class="keyword">typename</span> result_of&lt;Transformer(generated_value_type)&gt;::type;</div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;  <span class="keyword">using</span> transformed_type = optional&lt;transformed_value_type&gt;;</div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;</div><div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;  <span class="keyword">auto</span> generated_queue = ex.<a class="code" href="classgrppi_1_1parallel__execution__native.html#a5c310952de159f2b4d62bdae4b360d8f">make_queue</a>&lt;generated_type&gt;();</div><div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;  <span class="keyword">auto</span> transformed_queue = ex.<a class="code" href="classgrppi_1_1parallel__execution__native.html#a5c310952de159f2b4d62bdae4b360d8f">make_queue</a>&lt;transformed_type&gt;();</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;</div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;  atomic&lt;int&gt; done_threads(0);</div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;  vector&lt;thread&gt; tasks;</div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;</div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=0; i&lt;ex.<a class="code" href="classgrppi_1_1parallel__execution__native.html#aae3c5760c422c19a391ce1ddaa5e9f0b">concurrency_degree</a>(); ++i) {</div><div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;    tasks.emplace_back([&amp;](){</div><div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;      <span class="keyword">auto</span> manager = ex.<a class="code" href="classgrppi_1_1parallel__execution__native.html#aa3fb66a10cab14001a371be7b351c745">thread_manager</a>();</div><div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;</div><div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;      <span class="keyword">auto</span> item{generated_queue.pop()};</div><div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;      <span class="keywordflow">while</span> (item) {</div><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;        transformed_queue.push(transformed_type{transform_op(*item)});</div><div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;        item = generated_queue.pop();</div><div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;      }</div><div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;      generated_queue.push(item);</div><div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;      done_threads++;</div><div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;      <span class="keywordflow">if</span> (done_threads==ex.<a class="code" href="classgrppi_1_1parallel__execution__native.html#aae3c5760c422c19a391ce1ddaa5e9f0b">concurrency_degree</a>()) {</div><div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;        transformed_queue.push(transformed_type{});</div><div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;      }</div><div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;    });</div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;  }</div><div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;</div><div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;  tasks.emplace_back([&amp;](){</div><div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;    <span class="keyword">auto</span> manager = ex.<a class="code" href="classgrppi_1_1parallel__execution__native.html#aa3fb66a10cab14001a371be7b351c745">thread_manager</a>();</div><div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;</div><div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;    <span class="keyword">auto</span> item{transformed_queue.pop()};</div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;    <span class="keywordflow">while</span> (item) {</div><div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;      consume_op( item.value() );</div><div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;      item = transformed_queue.pop( );</div><div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;    }</div><div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;  });</div><div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;</div><div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;  <span class="keywordflow">for</span> (;;) {</div><div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;    <span class="keyword">auto</span>  item{generate_op()};</div><div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;    generated_queue.push(item);</div><div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;    <span class="keywordflow">if</span>(!item) <span class="keywordflow">break</span>;</div><div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;  }</div><div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;</div><div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;  <span class="keywordflow">for</span> (<span class="keyword">auto</span> &amp;&amp; t : tasks) { t.join(); }</div><div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;}</div><div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;</div><div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;}</div><div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;</div><div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;<span class="preprocessor">#endif</span></div><div class="ttc" id="namespacegrppi_html"><div class="ttname"><a href="namespacegrppi.html">grppi</a></div><div class="ttdef"><b>Definition:</b> callable_traits.h:24</div></div>
<div class="ttc" id="classgrppi_1_1parallel__execution__native_html_aae3c5760c422c19a391ce1ddaa5e9f0b"><div class="ttname"><a href="classgrppi_1_1parallel__execution__native.html#aae3c5760c422c19a391ce1ddaa5e9f0b">grppi::parallel_execution_native::concurrency_degree</a></div><div class="ttdeci">int concurrency_degree() const noexcept</div><div class="ttdoc">Get number of grppi trheads. </div><div class="ttdef"><b>Definition:</b> parallel_execution_native.h:178</div></div>
<div class="ttc" id="namespacestd_html"><div class="ttname"><a href="namespacestd.html">std</a></div><div class="ttdoc">STL namespace. </div></div>
<div class="ttc" id="classgrppi_1_1parallel__execution__native_html"><div class="ttname"><a href="classgrppi_1_1parallel__execution__native.html">grppi::parallel_execution_native</a></div><div class="ttdoc">Native parallel execution policy. This policy uses ISO C++ threads as implementation building block a...</div><div class="ttdef"><b>Definition:</b> parallel_execution_native.h:136</div></div>
<div class="ttc" id="classgrppi_1_1parallel__execution__native_html_aa3fb66a10cab14001a371be7b351c745"><div class="ttname"><a href="classgrppi_1_1parallel__execution__native.html#aa3fb66a10cab14001a371be7b351c745">grppi::parallel_execution_native::thread_manager</a></div><div class="ttdeci">native_thread_manager thread_manager()</div><div class="ttdoc">Get a manager object for registration/deregistration in the thread index table for current thread...</div><div class="ttdef"><b>Definition:</b> parallel_execution_native.h:199</div></div>
<div class="ttc" id="group__farm__pattern_html_ga26bdb7c1b6c3d4bedbcfc1774d00833c"><div class="ttname"><a href="group__farm__pattern.html#ga26bdb7c1b6c3d4bedbcfc1774d00833c">grppi::farm</a></div><div class="ttdeci">auto farm(Execution &amp;ex, Transformer &amp;&amp;transform_op)</div><div class="ttdoc">Invoke Farm pattern on a data stream that can be composed in other streaming patterns. </div><div class="ttdef"><b>Definition:</b> farm.h:51</div></div>
<div class="ttc" id="parallel__execution__native_8h_html"><div class="ttname"><a href="parallel__execution__native_8h.html">parallel_execution_native.h</a></div></div>
<div class="ttc" id="classgrppi_1_1parallel__execution__native_html_a5c310952de159f2b4d62bdae4b360d8f"><div class="ttname"><a href="classgrppi_1_1parallel__execution__native.html#a5c310952de159f2b4d62bdae4b360d8f">grppi::parallel_execution_native::make_queue</a></div><div class="ttdeci">mpmc_queue&lt; T &gt; make_queue() const </div><div class="ttdoc">Makes a communication queue for elements of type T. Constructs a queue using the attributes that can ...</div><div class="ttdef"><b>Definition:</b> parallel_execution_native.h:225</div></div>
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